A kind of ultraviolet spectrum detection method of chloride ion concentration
A technology of chloride ion concentration and ultraviolet spectroscopy, which is applied in the field of chloride ion concentration testing, can solve problems such as the neglect of Br ion concentration and the inability to rule out the effect of Br ions, and achieve the effects of improving algorithm accuracy, high innovation, and enhancing robustness
Active Publication Date: 2022-06-28
DALIAN UNIV OF TECH
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[0006] The role of Br ions cannot be ruled out in the silver nitrate titration method, nor can it be ruled out in the ultraviolet spectrum absorption, but in actual use, the sea sand has been washed with water, and the concentration of Br ions can basically be ignored.
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[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention. It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.
[0031] An embodiment of an ultraviolet spectrum detection method for chloride ion concentration is ...
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The invention provides an ultraviolet spectrum detection method of chloride ion concentration, which is applied to the analysis of chloride ion content of building materials such as washed sea sand and concrete. It includes the following steps: configure different chloride ion concentration calibration solutions and measure the absorbance; take the absorbance and concentration values at 200nm to 190nm, use the calibration algorithm in the detailed description to calibrate, and establish the relationship model between absorbance and concentration; take out a certain amount of samples , pulverize the sample thoroughly, put it into a muffle furnace in an aerobic environment, and burn it thoroughly; dissolve the burned powder in distilled water, stir, dissolve, and let it stand for a while; use a UV spectrophotometer to measure at least the absorbance at 210-180nm ;Use dual wavelengths for turbidity compensation algorithm, use 190nm-200nm band for calibration, bring into the model to obtain the solution concentration, convert the volume, obtain the total chloride ion mass, convert the mass of the solid sample, and obtain the chloride ion mass fraction of the sample.
Description
technical field [0001] The invention relates to the technical field of chloride ion concentration testing, and can be used for the concentration measurement of chloride ions in building materials, such as washing sea sand and gravel, analyzing the chloride ion concentration in building materials such as concrete. Background technique [0002] Spectrophotometer is a commonly used method to measure components and their content. In solution absorption, based on Lambert Beer's law, qualitative and quantitative analysis of related components can be performed. [0003] Chloride ions in concrete can cause corrosion of steel bars, reduce concrete wear resistance, chemical resistance and strength, thereby reducing concrete durability. Because sea sand in building materials is taken from the marine environment, the content of chloride ions is often high, so it needs to be cleaned and tested for chloride ions. Chloride ion exists widely as a harmful component in engineering constructi...
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IPC IPC(8): G01N21/33G01N1/28G01N1/44
CPCG01N21/33G01N1/286G01N1/44G01N2001/2866
Inventor 刘涛张弛刘志红李红孙长森
Owner DALIAN UNIV OF TECH